oracle利用正则表达式对字符串进行拆分

常规字符拆分方式

select REGEXP_SUBSTR(str, '[^,]+', 1, LEVEL) STR
  from (select '11,12,13,14,15,16' str from dual)
CONNECT BY LEVEL <= REGEXP_COUNT(str, '[^,]+');

 

使用特数字符拆分：

oracle文本中的换行符、回车符、制表符
制表符 chr(9)
换行符 chr(10)
回车符 chr(13)

换行符拆分示例：

with data_change as
(select REGEXP_SUBSTR(str, '[^' || chr(10) || ']+', 1, LEVEL) STR
from (select 'A
B
C
D
E' str
from dual)
CONNECT BY LEVEL <= REGEXP_COUNT(str, '[^' || chr(10) || ']+'))
select c.str from data_change c

 

示例：计算一个二进制字符串中连续为0的最大个数

select max(length(REGEXP_SUBSTR(str, '[^1]+', 1, LEVEL))) STR
  from (select '100010100000000' str from dual)
CONNECT BY LEVEL <= REGEXP_COUNT(str, '[^1]+');